When it comes to ascending a summit, first to the top usually wins. News this week confirmed that Working Title’s Everest, to be released by Universal, is a go. The film, from director Baltasar Kormákur (2 Guns) began production Monday in Italy, with Jake Gyllenhaal, Josh Brolin, Jason Clarke and John Hawkes playing four of the climbers who attempted the disastrous 1996 ascent of Mount Everest in the Himalayas, only to be thwarted with terrible conditions that led to the loss of many lives.

Now that this film is in production, will it kill a competing Everest film at Sony?

Sony declined to comment on its project, which takes place in the 1920s and chronicles British climber George Mallory’s attempts to scale the world’s tallest mountain. One source close to the production says the studio is still committed to the movie, but the film, which Doug Liman (Mr. and Mrs. Smith) is set to direct after finishing the upcoming Tom Cruise-starrer Edge of Tomorrow, will no longer begin production in the next couple of months as originally planned.

Rather, the start date on the film — which now carries the title The Summit andstill has Tom Hardy (Inception) attached to play Mallory and Luke Evans (Fast & Furious 6) to play his Australian rival George Finch — has been pushed to either early summer or perhaps even to 2015.

According to another source, the studio’s hesitation on the project centers on concern over how to sell the the film domestically. Overseas, the film’s prospects appear much healthier considering the storyline and international cast but in the U.S. audiences are often reluctant to give period films a chance.

Complicating matters, a schedule change may force star Hardy to drop out. As reported earlier, Benedict Cumberbatch (Sherlock) is still interested in the lead role should Hardy need to leave.

Sony is also being more cost conscious after a rough 2013 and launching a $60 million movie with a competing film in the pipeline may not look too appealing. Last summer the studio was on the wrong end of dueling White House disaster movies. Their White House Down with Channing Tatum and Jamie Foxx opened at the end of June, earning $73 million. It had followed Film District’s Olympus Has Fallen, whichopened in March and grossed $98 million.

Still, sources close to the project says the film, which was scripted by Sheldon Turner (Up in the Air), is still important to the studio.

The trick now is to keep that enthusiasm from falling off the mountain.